Analysis and Experimental Study of Permanent Magnet Machines With In-Situ Magnetization

This paper evaluates the performance of surface-mounted permanent-magnet (PM) machines with anisotropic rare-earth magnets magnetized using its own stator windings. The magnets in this process (often called in-situ magnetization) are magnetized after complete assembly. For manufacture of PM machines...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2013-05, Vol.49 (5), p.2351-2354
Main Authors: Hsieh, Min-Fu, Hsu, You-Chiuan, Chen, Po-Ting
Format: Article
Language:English
Subjects:
Anisotropy
Assembly
Coils (windings)
Cross-disciplinary physics: materials science
rheology
Current measurement
Demagnetization
Design engineering
EMF
Exact sciences and technology
Finite element analysis
In-situ magnetization
Magnetism
Magnetization
Magnets
Materials science
Mathematical analysis
Other topics in materials science
permanent magnet machines
Permanent magnet motors
Perpendicular magnetic anisotropy
Physics
post-assembly magnetization
Rare earth metals
Windings
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Summary:This paper evaluates the performance of surface-mounted permanent-magnet (PM) machines with anisotropic rare-earth magnets magnetized using its own stator windings. The magnets in this process (often called in-situ magnetization) are magnetized after complete assembly. For manufacture of PM machines using this process, part of the magnet may suffer from weaker magnetization due to the magnetizing flux pattern, in particular on the two sides of the anisotropic magnets. The machine performance can thus be affected and needs to be evaluated. The current required to sufficiently magnetize the machine should be carefully studied. In this paper, both finite element analysis and experiments on prototype PM machines manufactured with in-situ magnetization are used. The concentrated and distributed winding machines are both considered. The results show that distributed winding machines can magnetize the rotors more easily than concentrated winding ones. Also, it is found that a magnetizing field of 2.5 times coercivity allows the machine back EMF magnitude to achieve the levels of pre-magnetized cases.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2013.2239280